Intro to JavaScript - "Hello World"

A set of flashcards covering basic concepts, definitions, and functionalities in JavaScript as introduced in the lecture.

What is a programming language?

A set of instructions that tell a computer what to do and how to do it.

What is JavaScript?

A programming language used to add interactivity and dynamic behaviour to web pages; 98% of websites use JS.

What is Node.js?

An open source cross platform runtime environment for executing JS code outside of a web browser.

What is debugging?

The process of identifying and fixing errors in code.

What are variables?

Containers for storing information in programming.

What does 'let' do in JavaScript?

Declares a variable that can be reassigned.

What does 'const' do in JavaScript?

Declares a variable that cannot be changed and should remain constant.

What is a string in JavaScript?

A data type that represents a string of characters, used to store textual information.

What is the difference between 'undefined' and 'null'?

'Undefined' indicates a variable that hasn’t been assigned a value; 'null' means a variable intentionally holds no value.

What is an arithmetic operator?

Symbols that perform mathematical operations, like addition (+) and subtraction (-).

What is concatenation in JavaScript?

Joining two or more strings together to create a longer string.

What is an array?

A data type that allows us to store multiple elements within a single variable.

What is syntax in programming?

A set of rules that defines how symbols and characters can be used in code.

What is the purpose of comments in JavaScript?

To describe parts of code, helping other programmers understand it.

What does the + operator do when used with strings?

It concatenates strings together.

What is interpolation in JavaScript?

Including variables directly within strings, recognized by backticks and the $ sign.